Commissioner of Railway Safety (CRS) will inspect the corridor in July so that Mumbaikars get to use part of the route by August 2013.
The Versova-Andheri-Ghatkopar metro rail will be opened to public in two phases, the first phase between Versova and Airport Road station in August and second between Airport Road station and Ghatkopar by December 2013.
The entire 11.4-km-long route will be ready for public use only by the end of December or early next year.
"Representatives from the Research Design and Standards Organisation (RDSO) will first oversee some of the rolling stock testing at the site and some at factory level, only then other testing procedures will be followed," said sources.
Another official said, "Along with RDSO inspection, trial runs for the metro rail will be carried out from the third week of April."
As installation of Overhead Equipment is currently underway along the corridor between Versova and Marol metro stations.
The test runs will be done only on this eight-kilometre stretch, while the balance three-odd kilometres will be covered only after August.
The procedures for trial runs will take around three months to check and certify various systems and even to thoroughly check the System Integration Testing. Once internal System Integration Testing is done, the commissioner of railway safety will inspect the entire arrangement for desired results and safety standards.
"As per the schedule prepared, the commissioner of railway safety will start supervision only in the first week of July," said the official.
If the Mumbai Metro One Private Limited, Reliance Infrastructure-led consortium, would have received Right of Way as per plans, then the Versova-Andheri-Ghatkopar route would have been completed by March 2012.